The ornamental design for a beverageinsulator, as shown and described.
FIG. 1 is a top perspective view of a beverage insulator;
FIG. 2 is a top plan view of the beverage insulator shown in FIG. 1;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a front elevational view thereof; and,
FIG. 7 is a left side elevational view thereof.
The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines shown in the drawings are for the purpose of illustrating part of the beverage insulator that forms no part of the claimed design.